Reverse PostingIf the amount you are out of balance is divisible by 2, the error
may be an entry has been posted backwards. That is to say
something that should be a credit is posted as a debit and vice versa.To
find this error, divide your error by 2 and look for an entry
of the resulting amount. Then make sure it was posted in the correct
direction.

Transpositions

Finding
a transposition is fascinating. It is where two digits of
a number have been listed in reverse. For example 290 is listed as
920. the 2 and 9 are transposed causing an error of 630. If the balance error is
divisible by 9, a transposition is likely.

You can tell how far apart
the digits transposed are by how many times the error is divisible by
9. In the example above the error (630) is divisible by 9 70 times, so we would
know that the digits transposed have a difference of 7, such as a 1 and
8, 2 and 9, or 0 and 7. In our case, it is 2 and 9.

Since the error is divisible by 9 70 times and not 7 or 700, we would know
that the digits transposed are in the hundreds and tens digit location.
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